Shinjieo horn



Reissuetl Apr. 9, 1929.

UNITED STATES Re. 17,267 PATENT OFFICE.

SHINJIRO HORII, 0F TOKYO, JAPAN.

STENCIL SHEET.

No Drawing. Original No. 1,587,954, dated June 8, 1926, Serial No. 40,105, filed June 27, 1925. Application for reissue filed February 15, 1929. Serial No. 340,322.

My invention relates to improvements in stencil sheets of the typecommonly used for autographic and typewriting duplications, consisting of a sheet of fibrous material coated or impregnated with a composition comprising esters of polysaccharides, 'naphthenic acid glycol-ides and tempering agents, such as fats, fatty acids and waxes, for the purpose of preparing the superior stencil sheets which offer a considerable resistance to atmospheric influences and give a large number of clear and sharp copies from one original.

, It is well known that a solution of collodion or celluloid, combined with castor oil or other fatty oils as a tempering agent, has been used for a coating material to produce stencil sheets. Such a composition does not, however, produce superior stencil sheets, having the disadvantage of being sticky and, moreover, the coated medium is not soft enough to produce a clear writing by the use of a .stylus or by the impact of the type of a writing machine.

According to the present invention the coating material of the stencil sheets consists of a solution of esters of polysaccharides, combined with naphthenie acid glycol-ides.

It may be noted that the naphthenie acid glycerides have high viscosity and are very stable and limpid at even very low tempera tures. They are miscible with fatty oils, fats and waxes. And the naphthenic glycerides form also an emulsion with collodion or eelluloid solution, which is a suitable coating material for stencil sheets.

It has been found that a composition comprising esters of polysaccharides, naphthenic acid 'glyeerides and fatty and waxy materials (fatty oils, fats, waxes, fatty acids, etc.) is the most superior coating material for stencil sheets, which produces a coating of the tdesired softness but without stickiness, does not become hardened in cold weather. The stencil sheets thus obtained can be used throughout an extended period of time without any change in the coating and produce therefrom a large number of clear and sharp copies.

In carryin out the invention I coat or impregnate a slieet of fibrous material, for instance yoshino paper, with acoating solution prepared by dissolving an ester-or a mixture of esters of polysaccharides, such as starch acetates, cellulose acetates, cellulose nitrates or cellulose xanthate, in suitable solcircumstances. The following is an example:

Parts by i weight. Pyroxylin Naphthenic acid glyccrides 15 Geresin 5 StearineHr 5 Oleine 5 Methyl alcohol 15 Acetone 15 Amyl acetate Petroleum benzine 20 As stated, the coated sheets remain throughout an extended period of time practicall'y unchanged without the drawback of becoming sticky or friable. By the use of a stylus or the blow of the type of a typewriter, without necessity of moistening the sheets with water or moistening solutions, clear characters may be easily produced thereon.

What I claim is: 1. A stencil sheet comprising a base of fibrous material impregnated with a composition including an ester of polysaccharides, and naphthenic acid glycerides.

2. A stencil sheet comprlsing a base of fibrous material impregnated with a composition including a mixture of various esters of polysaccharides, and naphthenic acid glycerides.

3. A stencil sheet comprising a base of fibrous material impregnated with a composition including an ester of polysaccharides, naphthenic acid glycerides, andtempering agents.

4. A stencil sheet comprising a base of fibrous material impregnated with a composition including a mixture of various esters of polysaccharides, naphthenic acid glycerides, and tempering agents.-

5. A stencil sheet comprising a base of fibrous material impregnated'with a composition including. a solution of an ester of polysaccharides, and naphthenie acid glycerides.

6/ A stencil sheet comprising a base of fibrous material imp egnated with a composition including asolution of an ester of polysaccharides, naphthenie acid glycerides, and tempering agents.

7. A stencil sheet comprising a base of fibrous material impregnated With a composition including an ester of polysaccharides, na lflithenic acid glycerides, and fatty materla s. I

8. A stencil sheet comprising. a base offibrous material impregnated with a composition including a solution of esters of polysaccharides, naphthenic acid glycerides, and iiatty materials.

9. A stencil sheet comprising a base of fibrous material impregnated with a composition including an ester of polysaccharides, naphthenic acid glycerides, and fatty and waxy materials.

10. A stencil sheet comprising a base of fibrous material impregnated with a composition including a solution of'esters of polysaccharides, naphthenic acid glycerides, and

'fatty and Waxy materials.

In testimony whereof I aflix my signature;

SHIN J IRO HORII. 

